3mm Torx Countersunk Chipboard Screws A2 Stainless
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- Stainless grade A2 (304)
- Drive Torx
- Head type Countersunk Head
- Head angle 90°
How to measure Torx countersunk chipboard screws
| Dimension | Symbol | Value |
|---|---|---|
| Thread diameter (nominal) | d | 3.0 mm |
| Head diameter | dk | 5.6 to 6.0 mm |
| Head height (max) | k | 1.9 mm |
| Torx bit size | T | T10 |
| Lengths available (overall, including head) | L | 10, 12, 16, 20, 25, 30 mm |
A2 stainless steel chipboard screws in 3mm, with a flat countersunk head and a Torx recess that takes a T10 bit. The thread runs from the tip right up to the head. Head sizes are taken from the withdrawn DIN 7505 table for flat countersunk chipboard screws.
A Torx recess has six lobes, and the bit is much less likely to lift out of it than a pozi bit. A2 stainless copes with damp conditions as well as dry. There is no minimum order, and the price per screw falls as you add more.
What these screws are for
Chipboard screws are designed for particleboard, MDF and other engineered boards, where the core is soft and crumbly. The full-length thread keeps gripping right up to the head. Kitchen and bathroom cabinets, MDF and particleboard furniture and shop fitting are the usual jobs, and the countersunk head leaves the surface flush.
The sharp tip and cutting thread mean most boards will take the screw without a pilot hole. Pre-drill near an edge or corner so the board does not split.
Prefer a pozi drive? The 3mm pozi countersunk chipboard screws are the same size with a PZ1 recess.
Want a rounded head that sits on top of the surface? The 3mm pozi pan head chipboard screws are the same size.
Torx chipboard screw sizes
3mm is the nominal thread diameter and is the closest metric equivalent of a No.4. The Torx chipboard range covers 3mm (No.4) to 6mm (No.14).
Length is measured overall with the head included, so a 40mm screw is 40mm from the top of the head to the tip. There are 6 lengths in 3mm, running from 10mm to 30mm. Pick one that bites well into the board but stops short of the far face.
A 90 degree countersink cutter suits the head, which measures 5.6 to 6mm across and up to 1.9mm high.
Which Torx bit to use
The 3mm takes a T10 bit. Across the range it is T10 on the 3mm and 3.5mm, T20 on the 4mm, and T25 on the 5mm and 6mm.
A2 stainless grades
A2, also called 304 or 18/8, is the usual stainless grade for fixings and suits indoor work and most outdoor jobs. It can show a slight pull on a magnet, and that is normal.
If the board stays wet or humid, A4 is worth considering. The A2 stainless steel and A4 stainless steel guides explain how the two grades differ.
Torx chipboard screw questions
What size is a 3mm Torx chipboard screw?
It is 3mm across the thread, which is close to a No.4 gauge. The flat countersunk head is 5.6 to 6mm across and up to 1.9mm high, and the recess takes a T10 bit.
What Torx bit fits a 3mm chipboard screw?
A T10 bit. The bit size is also listed in the Dimensions table on this page.
Can you screw into chipboard without a pilot hole?
In most cases yes, because the sharp tip and thread cut their own way into chipboard and MDF. Close to a board edge or corner, drill a small pilot hole first to lower the risk of splitting.
How do I choose the length of a chipboard screw?
Measure the board you are fixing into and pick a length that goes well in without reaching the far face. Length here includes the head, so it is counted from the flat top of the head to the tip.
Is Torx better than pozi for chipboard screws?
Torx is much less prone to cam-out, which is when the bit lifts out of the recess under load. Pozi still works well and is a common choice, so it comes down to preference.
How do I measure a chipboard screw?
Measure across the thread with calipers. A 3mm screw reads 3mm or just under, as 3mm is the nominal size. The measuring guide above shows how to measure the length and the head.